Shock-absorber.



P, M. PRER.

1 SHOCK ABSORBBR. APPLIOATION FILED JAN. 13, 1910.1

Patented 111111228, 1911.

2 SHEETS-SHEET l.

FIGA.

INVENTOR: gpc' P. M. PREER.

SHOCK ABSORBER. 4 APPLIOATION FILED JAN. 13,1910. 987,977. Patenamanzs, 1911.

2 SHEETS-SHEET 2.

WITNESSESZ INVENTORI ha d- I W/w/.q WL. gm

` Absorbers, of which the following isa speci.

a violent shock is. carried' to, the vehicle UNITED STATES PATENT oEEIcE.l

PHELPS M. FREE, OF RO(1I-ILESTER,` NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE CONNECTICUT SHOCK ABSORBER COMPANY, OF MERIDEN, CONNECTICUT, A

CORPORATION 0F CONNECTICUT.

v SIE-IOCK-.ABSOREER.

citizen of the United States, and residentof Rochester, in the county of Monroe and State ofV` New York,ghave invented certain new and useful 'Improvementsin.' Shock- This invention relates totshock absorbers, and particularly spring resist-ance. The object of the device 'which' is` ,described below, is to leave the vehicle springs free toact under ordinary shocks encountered on the road, but to-exert a yielding resistance to the relative movement .of the body and running gear of the 'vehicle when tion. partly in section, showing the-shock 'absorber in its' normalv position;A Fig. 24 is as section on 'the'line 2-2of Fig. 1; Fig.3. is Aa view 'similar to Fig.1,. but showing the parts operatively disposed; Fig. 4 is an ele vation of the device, reduced 1n size, show- -corresponding with the -view of va detail common to hiele. 'In Fig. 4 the arm showing a. modified form;

parts 1 and 2. To the art lis'iixed an arm- 3A thatextends upward adaptedat its upper end for attachment to the frame A or other suitable part of a vehicle body. A similar arm 4, that is divided longitudinally 2) so Ithat it spans the casings 1 and 2, is adapted for attachment at its lower end to 'av running gear .of a ve- 4 -is represented as pivoted' in a bracket 1B th Between the upper ends block 5, that has in its pro3ecting ends a series-of notches '6. The arms t have each., a

series of lugs. 7 thatproject'intothe notches aforesaid and so render the block-5 immov l able with respect to the arms 4. A bolt 8 extends through both the block and the arm,

to those characterized bytlforrn'sV -part of' the support C for the, vehicle-spring D.

of the two-part`- arm-4 and within the casing, is a square Specification of Letters Patent. Patented Mar, 28, 1911 Application mea January 13, 1910.4 4serialrrol 537,971-.

and vserves to maintain the engagement of the lugs and the notches, as Well as to hold 4 the parts 1 and 2 of the casing together.

Surroundingthe block 5 and fitting closely to its sides is a disk 9 that has a symmetrical but partially eccentric contour Aon its periphery (Fig. 8). A series of lat rings 10 are set within the casing 2, with s Vtheir ends lresting in pockets 11 that are ofl set in its'rim. These springs are adapted to lie against the periphery of the disk 9, but in the present instance chafing strips 12 are shown as lying between the springs and the disk to receive the' wear that would otherwise come on the latter. These-strips vmay be easily and cheaply replaced Iby new vones when worn thin.

The disk 9 ismovable with the arm 4,. ybecause engaged by the block while the casin'g, which is rigidly connected with the -arm 3, controls the movement of the springs 10 around the said disk. These portions 13.

of the periphery of the disk 9 that normally bear'against each of the springs 10 (Fig. 1) are concentricvw'ith the bolt 8 for a short dist-ance on either side of a line drawn from the center of the bolt to the center of the spring, at 4right angles to the latter". Between these portions 13 of the disk 9 its contour is eccentric to the pivot-bolt 8. Said eccentric portions '14 have longer radii l than the'circle of which the portions 13 are arcs, and they extend' some distance outside of'said circle. These portions 14 thus con- .stitute la series `of can faces equal in number to the springs 10'. When the disk 9 and thesprings 10 are Ven' an opposite rotary movement, said aces'14 bear against the strips 12, and force the said springs toward Athe vrim of the casing. The ends of the springs are immovable, as they are retained in the pockets 11, and so the partial rotation pf the disk 9 results in bending the springs at their middle, as shown in Fig. 3. The

farther the disk is turned, the more thev springs will be bent, and the greater will be the force required to bend them. Asthe bending of the springs occurs only after the f i eccentrlc portions 14.- have begun to press against them, itfollows that the disk 9 may be turned 'with comparative some distance since the concentric portions freedom either' way from the position shown in Fig. l, fory 13- are of no effect as regardsv the movement In this construction working limit of the vehicle springs D, butl this movement becomes extreme, as

when happens When the vehicle encounters a severe hump in the road, the disk 9 is turned in one direction, by the upward movement of the arm 4, While t\he casing parts 1 and 2, I

with the springs 10, a`re turned so far in the opposite direction, by the downward move# ment of -the arm 3, till the portions 14 are brought beneath -thel springs 10 and bend them as shown in Fig. 3L

It will be noted from the foregoing that the rubbing contact of the disk and springs does not serve to oppose the movement of the parts and is merely incidental to the movement of the parts after they have been brought into relative engagement. Again, lhc action of the parts is practically frictionless until the eccentric portions 14 begin to bend outwardly the strips' 12, and' so the normal action of the vehicle springs D is not'impeded in the least.

In the construction shown in Figs. 5 to 9, inclusive, the-lugs 7 that enter the notches (3 in the square block 5a, project from a bracket 4 that is attached to one of vthe vehicle arts `(in the drawings it is shown attached? to the vehicle body), thus dispensing with one of the'armsbefore descrlbed;

to the casing 1 is preferably connected with the support C for the vvehlcle springs by a link 15. The operation is the same as before described.

This construction renders ing laterally the arm 3 that is fixed case surrounding and a lever arm carried by each part and projecting laterally therefrom, said cam having a plu-rality of 'high points, a plurality of springs arranged to be flexed by the rotation of said cam, said sprin being carried by said case and a connectlon between the cam and its lever arm comprising an angular block extending concentrically vinto the cam, said cam having an angular recess to receive said block wherein said blockl is held against rotation independently of the cam, and means for connectingaid lever to the outer end of said block.

2. In a shock absorber', two relatively rotatable parts, one a cam, the'other a case, said cam having aplurality of high points,

- a plurality of sprlngsheld within the case and arranged 'tangentially vto said cam for operation thereby, saidcase having pockets formed therein for the reception of theends of the springs, the back of said springs being separated from said case excepting at their ends whereby said springs may be flexed.

. 3; In a shock absorbeiga spring carrying case comprising two telescopic members havoffset' portions forming integralr pockets to receive the Vends of the springs, a plurality of springs within said case, the ends of said springs being seated in said pockets, a rotatable camwithin the case and between the springs, saidvcam haV- ing a plurality .of highVV points, and means for connecting said parts to avehicle lWhere,- by the relative ,movement vof the vehicle body .relatively t part a relative rotary movement of said cam and spring carrying element.

PHELPS M. FREER.

p l. In a shock absorber comprising twov Witnesses:

y relatively rotatable parts, one part com- D.GURNEE,

prising a cam, the other part comprising a C. W. CARROLL.

Copies of this patent may be obtained for ve cents eachby vaddressing thev Commissioner of Patents,

Washington, D. C. v

supporting said cam,

o the axle thereof will im- 

